The association between developmental trajectories of language-related white matter fiber pathways from 6 to 24 months of age and individual differences in language production at 24 months of age was investigated. The splenium of the corpus callosum, a fiber pathway projecting through the posterior hub of the default mode network to occipital…

Background: Allelic variation in the promoter region of a gene that encodes tryptophan hydroxylase isoform 2 (TPH2), a rate-limiting enzyme of serotonin synthesis in the central nervous system, has been associated with variations in cognitive function and vulnerability to affective spectrum disorders. Little is known about the effects of this gene…

Used multilevel analyses to examined the amounts of time infants spent asleep, awake, content, feeding, fussing, and crying at 2, 6, 12, and 40 weeks of age. Found that day-to-day fluctuations accounted for between 44 and 53% of the variance in amounts of time sleeping, fussing, and crying. (MDM)

Investigated developmental change and patterns of individual differences in dimensions of infant temperament. Rothbart Infant Behavior Questionnaire (IBQ) was completed for subjects 5 times between 6 weeks and 30 months of age. Interpretable age changes were found for emotional reactivity, but not for the index of regulation (IBQ soothability).…

Reviews research on, and offers definitions for, play and learning in infancy. Discusses the developmental sequence in early exploratory play and learning, individual differences in exploratory play, and the relationship between rearing environments and quality of exploratory play. Discusses implications for planning and implementing infant care…

This volume is the first in "The Course of Life" series which contains original contributions from an international group of scientists and clinicians who have produced much of the current knowledge about the phases of human personality development. These contributions cover the continuum of human development from the prenatal phase…